Table of Contents
Paragraph
Number
Title
Page
Number
MOTOROLA
MC68SC302 USER’S MANUAL
vii
2.3.3
2.3.3.1
2.3.3.2
2.3.3.3
2.3.3.4
2.3.3.5
2.3.4
2.3.4.1
2.3.4.2
2.3.4.3
2.3.4.4
2.3.4.5
2.3.4.6
SCP Pins............................................................................................... 2-12
SPRXD—SCP Receive Serial Data Pin................................................ 2-12
SPTXD—SCP Transmit Serial Data Pin ............................................... 2-12
SPCLK—SCP Clock Pin ....................................................................... 2-12
E2EN—EEPROM Enable Pin ............................................................... 2-12
SCPEN1-3 —SCP Slave Enable 1-3 Pins ............................................ 2-12
Multi-Function I/O Pins.......................................................................... 2-12
PORT A................................................................................................. 2-13
Port A Registers.................................................................................... 2-14
Port A SCP Enable Control................................................................... 2-15
Multi-Function Pins................................................................................ 2-15
Pin Multi-Function Select Register (PMFSR)........................................ 2-16
Special Pin Function in 8-Bit Mode ....................................................... 2-16
Section 3
Interrupt, Timer, and Power Control
Interrupt Controller .................................................................................. 3-1
Interrupt Controller Overview .................................................................. 3-1
Masking Interrupt Sources and Events ................................................... 3-1
Interrupt Handling Procedure.................................................................. 3-2
Wake Up On Interrupt ............................................................................. 3-2
Global Interrupt Mode Register (GIMR) .................................................. 3-3
Interrupt Pending Register (IPR)............................................................. 3-3
Interrupt Mask Register (IMR)................................................................. 3-4
Periodic Interrupt Timer........................................................................... 3-4
Overview ................................................................................................. 3-4
Periodic Timer Period Calculation........................................................... 3-4
Periodic Interrupt Timer Register (PITR)................................................. 3-5
ISA Power Control Registers................................................................... 3-5
3.1
3.1.1
3.1.2
3.1.3
3.1.4
3.1.5
3.1.6
3.1.7
3.1.8
3.1.8.1
3.1.8.2
3.1.8.3
3.2
Section 4
Communications Processor (CP)
Main Controller........................................................................................ 4-1
Command Set ......................................................................................... 4-2
Command Execution Latency ................................................................. 4-4
Serial Channels Physical Interface.......................................................... 4-4
IDL Interface............................................................................................ 4-5
GCI Interface........................................................................................... 4-7
PCM Highway Mode................................................................................ 4-9
Nonmultiplexed Serial Interface (NMSI)................................................ 4-12
Serial Interface Registers...................................................................... 4-12
Serial Interface Mode Register (SIMODE)............................................ 4-12
Serial Interface Mask Register (SIMASK)............................................. 4-14
Serial Communication Controllers (SCC).............................................. 4-15
SCC Features........................................................................................ 4-16
SCC Mode Register (SCM)................................................................... 4-16
4.1
4.2
4.2.1
4.3
4.3.1
4.3.2
4.3.3
4.3.4
4.4
4.4.1
4.4.2
4.5
4.5.1
4.5.2